Theodore John Kaczynski aka the "Unabomber" is a domestic terrorist and serial killer who between 1978 and 1995 killed 3 and wounded 23 others by attempting to start a nationwide combing campaign targeting people involved with modern technology. 

One page handwritten letter hand signed twice. The letter is hand dated June 25, 2017 and hand signed at the top of the first page, Ted Kaczynski. Hand signed again at the close, Best Regards, Ted Kaczynski.

Kaczynski has inserted a sheet of paper between the letter and the back of the envelope on which he writes a note to the mailroom., 
Includes the original prison mailed envelope with his complete return address postmarked June 30, 2017 and hand signed, Theodore John Kaczynski, with both his complete return address and the recipient's written by the Unabomber.

Theodore Kaczynski One Page Letter and Envelope Set Both Signed With Note